Crest-tailed mulgara

Dasycercus cristicauda

Blamed on foxes

IUCN status: Near Threatened

EPBC Predator Threat Rating: High

IUCN claim: “Threats are poorly understood but include predation by and competition with feral cats and Red Foxes,”

Studies in support

Mulgara were found in foxes’ diet (Mahon 1999; Paltridge 2002; Cupples et al. 2011); and mulgara were last confirmed in the Nullarbor 16 years after foxes arrived (Current submission).

Studies not in support

Mulgara were last confirmed in NSW 4 years before foxes arrived (Current submission).

Is the threat claim evidence-based?

There are no studies evidencing a negative association between foxes and mulgara populations. In contradiction with the claim, the extirpation record from NSW pre-dates the fox arrival record.

Evidence linking Dasycercus cristicauda to foxes. A. Systematic review of evidence for an association between Dasycercus cristicauda and foxes. Positive studies are in support of the hypothesis that foxes contribute to the decline of Dasycercus cristicauda, negative studies are not in support. Predation studies include studies documenting hunting or scavenging; baiting studies are associations between poison baiting and threatened mammal abundance where information on predator abundance is not provided; population studies are associations between threatened mammal and predator abundance. B. Last records of extirpated populations relative to earliest local records of foxes. Error bars show record uncertainty range. Predator arrival records were digitized from Fairfax 2019.
Evidence linking Dasycercus cristicauda to foxes. A. Systematic review of evidence for an association between Dasycercus cristicauda and foxes. Positive studies are in support of the hypothesis that foxes contribute to the decline of Dasycercus cristicauda, negative studies are not in support. Predation studies include studies documenting hunting or scavenging; baiting studies are associations between poison baiting and threatened mammal abundance where information on predator abundance is not provided; population studies are associations between threatened mammal and predator abundance. B. Last records of extirpated populations relative to earliest local records of foxes. Error bars show record uncertainty range. Predator arrival records were digitized from Fairfax 2019.

References

Cupples, J.B., Crowther, M.S., Story, G. and Letnic, M., 2011. Dietary overlap and prey selectivity among sympatric carnivores: could dingoes suppress foxes through competition for prey?. Journal of Mammalogy, 92(3), pp.590-600.

Current submission (2023) Scant evidence that introduced predators cause extinctions. Conservation Biology

EPBC. (2015) Threat Abatement Plan for Predation by Feral Cats. Environment Protection and Biodiversity Conservation Act 1999, Department of Environment, Government of Australia. (Table A1).

Fairfax, Dispersal of the introduced red fox (Vulpes vulpes) across Australia. Biol. Invasions 21, 1259-1268 (2019).

IUCN Red List. https://www.iucnredlist.org/ Accessed June 2023

Mahon, P.S., 1999. Predation by feral cats and red foxes and the dynamics of small mammal populations in arid Australia. PhD thesis, University of Sydney, Sydney, Australia.

Paltridge, R., 2002. The diets of cats, foxes and dingoes in relation to prey availability in the Tanami Desert, Northern Territory. Wildlife Research, 29(4), pp.389-403.